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You'll learn the following in this tutorial.
I have tried instructions below on Ubuntu Server but should work for all distributions running the BASH shell.
Display names and values of all environment variables
env
Assign value to an environment variable
TESTVAR=value
Example:
TESTVAR=/usr/local/sbin:/usr/local/bin
Command above assigns the value "/usr/local/sbin:/usr/local/bin" to the TESTVAR variable.
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Print value of a particular environment variable
echo $<variable name>
Example:
echo $TESTVAR
Command above prints the value of BASH's TESTVAR variable.
Append value to an existing environment variable:
<variable name>=$<variable name>:<new value>
Example:
TESTVAR=$TESTVAR:/bin
Command above appends "/bin" to the value of BASH's TESTVAR variable.
Make the variable globally accessible:
export <variable name>
Example:
export TESTVAR
Delete an environment variable:
unset <variable name>
Example:
unset TESTVAR
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